Boat-propeller.



PATENTED SEPT. 26, 1905.

M. PEREZ. BOAT PROPELLER. APPLICATION FILED 23.16. 1905.

2 SHEETSSHBET 1.

Z; I nventor' Rttomegs -Witnesses PATENTED SEPT. 26, 1905.

2 sums-sum 2 Z, Inventor Pkttomegs aefn? M. PEREZ.

BOAT PROPELLBR. 7 APPLICATION FILED Emma. 1905.

Witnesses ff MIGUEL PEREZ, OF ST. LOUIS, MISSOURI.

BOAT-PROPELLER.

Specification of Letters Patent.

Patented Sept. 26, 1905.

Application filed February 16, 1905. Serial No. 245,917.

To (LZZ whmn it may concern:

Be itknown that I, MIGUEL PEREZ, acitizen of the United States, residing at St. Louis, in the State of Missouri, have invented a new and useful Boat-Propeller, of which the following is aspecification.

This invention relates to propelling devices for vessels, and has for its principal object to provide a novel and effective means to be employed as a substitute for screw-propellers, paddle-wheels, and similardevices and to so construct and arrange the propeller that the vessel may be propelled at any desired speed and may be readily maneuvered,the propelling device being disposed on both sides of the bow and stern of the boat and driven by mechanisms so arranged that one may be driven faster than the other to assist in turning and steering the vessel.

\Vith these and other objects in view, as will more fully hereinafter appear, the invention consists in certain novel features of construction and arrangement of parts hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed outin the appended claims, it being understood that various changes in the form, proportions, size, and minor details of the structure may be made without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawings, Figure 1 is a side elevation, partly in the nature of a diagram, illustrating a vessel provided with propelling devices constructed in accordance with the invention. Fig. 2 is a plan view of the same. Fig. 3 is a sectional plan view, drawn to an enlarged scale, illustrating the arrangement of the propelling device at the stern of the boat. Fig. 4L is a sectional elevation of the same. Fig. 5 is a sectional elevation of one of the propellers disposed at the bow of the boat.

Similar numerals of reference are employed to indicate corresponding parts throughout the several figures of the drawings.

At each side of the bow of the vessel are arranged brackets 1, that are secured to or formed integral with tubes 2-, disposed in planes parallel with the line of the keel, and arranged in said tubes are rods 8, at the forward ends of which are conical propellers I. These propellers taper to a sharp point, and their rear ends may be either closed or open. The rear ends of the rods are connected by rods 5 to cranks 6 on an operating-shaft 7, provision being made for driving said cranks at different speeds for the purpose of steering the vessel.

In the operation of the propeller the rods 2 are moved outward, thrusting the conical propellers 4 forward into the water, which readily divides to permit the entrance of the pointed propeller. The direction of movement of the rod is then reversed, and the flat rear face, or in some cases the open end, of' the propeller will afford an extensive surface to the resisting body of water and will act to draw the vessel forward. The propelling devices may be reciprocated at any desired speed, and by stopping one or altering its speed with relation to that of the other the vessel may be readily turned either to port or starboard.

At the stern of the boat are arranged screwpropellers 10, having any desired number of blades and carried by tubular shafts 11, that are driven by a suitable engine 11. Through these hollow shafts extend rods 12, that are provided at their rear ends with propellers 4: of a character corresponding to the propellers 4:, with the exception that they do not taper to a sharp point. The propellers I are driven by a suitable engine 7, and in this case also provision is made for driving the propellers independently or at different speeds for maneuvering the vessel.

The screw-propellers are of the, ordinary type and are intended for the preliminary work in getting a vessel under way, after which they may be stopped and the boat driven by the propellers 4c and L.

The conical propellers f, situated at the rear of the screw-propellers, are found advantageous in that the current of water or wash from the propeller is made to engage with the conical surface of said propellers 4c, and the current is spread-into the form of an annular stream and directed against a resisting body of water of much greater area than the area of the screw-propeller, so that during the operation of the screw its effectiveness is materially increased.

In order that the propelling devices may drive the boat without jar, provision is made for advancing the forward propellers while the aft propellers are thrust rearward, and as the aft propellers move forward the forward propellers move to the rear, so that there is always one set of propellers moving rearward and tending to urge the boat on its course.

Having thus described the invention, \vhat l for revolving the shaft, a reoi 'n'ocat-ory rod is claimed is 1. In vessel-propelling devices, a pair of tubes arranged one on each side of the bow of the vessel and extending through the hull in a line parallel with the longitudinal plane of the keel, a second pair of tubes arranged at the stern of the vessel and projecting through the hull, also on lines parallel with the plane of the keel, rods extending through the tubes, conical propellers at the outer ends of the rods, and independent driving means for the pairs of rods at the bow and stern, said propelling means being arranged to move the forward propellers in one direction, While the aft propellers are simultaneously moved in the opposite direction.

2. In vessel-propelling devices,ascreW-propeller,a tubular shaft carrying the same, means extending through the shaft, and a conical propeller secured to the rod to the rear of the screw-propeller.

3. In a vessel-propelling device, a screwpropeller, a hollow shaft carrying the same, means for revolving the shaft, a rod extending through said shaft, a conical deflector secured to the rear end of the rod and having its pointed end adjacent to the rear of the propellcr, and means for reciprocating said rod.

In testimony that I claim the foregoing as my own I have hereto alfixed mysignature in the presence of two Witnesses.

MIGUEL PEREZ.

lVitnesses:

Human NORMAN, DAVID LANGAN. 

